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Garrett was born in the mid-1700s during American Revolution, in New England. Garrett was a hotheaded patriot who willingly fought for the colonies' right to self-govern. He was a true believer in the American dream.

He was transformed around the 1780s, during the war. The war's massive death toll gave local vampires the opportunity to feast frequently, Garrett was transformed by accident in the aftermath of the battle. Garrett was with an isolated group of ten soldiers when a vampire attacked them, knocking him unconscious at the beginning of the attack. The vampire, after draining the other nine soldiers, was sated enough and he didn't drink much of Garrett's blood. Thinking that Garrett was dead, the vampire ran afterwards. He woke up three days later as a fully-fledged vampire. Garrett is always curious and willing to investigate a mystery, and after his transformation he strove to understand what had happened to him.

Sometime after his transformation, he met Carlisle Cullen. Though he is not a vegetarian, he is among Carlisle's closest friends. In the movie, they met during the Siege of Yorktown. He also came across and befriended a nomadic couple during his travels, Makenna and Charles. He was also present in every American battle, once came close to biting Custer, but the Natives killed him before Garrett had the chance.

"These ancient ones did not come here for justice as they told you. We suspected as much, and now it has been proved. They came, misled, but with a valid excuse for their action. Witness now as they seek flimsy excuses to continue their true mission. Witness them struggle to find a justification for their true purpose—to destroy this family here."

Garrett is called to witness for the Cullen family when they are troubled by the Volturi. Though without special talent, Garrett enjoys challenges. He is intrigued by the Cullens and the Denali coven's lifestyle of drinking animal blood instead of human.

The remaining Denalis, plus their new covenmate, Garrett.

While in the presence of the other witnesses, he challenges Kate to test her power on him. She is successful in making him fall to his knees in pain, though he says it "sure was something", and joins her on his first try of animal blood. He later tells Aro that he believes that abstaining from human blood can be a powerful aid in bonding between vampires. At the same time, he learns about this lifestyle through Kate of the Denali coven. The two bond quickly, and it is Garrett who endures Kate's ability when he successfully stops her from attacking the Volturi after Caius killed her sister Irina (which would likely have resulted in her death as well as everyone else's). He tells the Volturi's witnesses of what he has seen from the family and what they suspect of the Volturi's true agenda - to acquire some of the Cullens' talented members, and tells them to consider joining their side, because the Volturi may not let them live long enough to spread the story.

In Alice Cullen's vision, a battle is erupted between the Cullens and the Volturi, as well as both sides' allies. Garrett sees Caius attempt to kill Tanya and rushes forward to kill him, sending him flying into Kate's hands, who electrocutes him while Tanya beheads him to avenge her dead sister. After witnessing his own demise through the vision, Aro talks his coven out of fighting.

With the confrontation resolved, he joins the Denalis as Kate's mate, and begins to practice his diet on animal blood.

Garrett was described as being 6'2" tall with a lanky build. He wears his long, sandy-colored hair tied back with a leather thong. His eyes have deep ruby colors, but after joining the Denali coven, they are expected to change to an amber color, and finally to gold due to the change of diet as long as he continues to consume animal blood. When he is thirsty, his eyes turn the darkest shade of black. His skin sparkles like diamonds upon exposure to sunlight.

In the Breaking Dawn - Part 2 movie, Garrett's appearance is different: his hair color is changed to dark brown, and its length only reaches down to his neck. He also has a stubble, and is noticeably taller than most of the other male vampires due to the casting of 6'5" tall actor, Lee Pace.

Garrett is shown to be very amiable, personable and easily interacts with others, especially with Kate's coven. Garrett is apparently very adventurous and very curious, as evidenced by his acceptance of Kate's challenge to experience her ability and later to assume vegetarianism, which he finds difficult to adjust to. He never lost the rebellious spirit of his human life, and loves a good fight, always rooting for the underdog. Also, he is hot-headed, but very brave and strongly believes in free will and compares the Cullens' resistance against the Volturi to America and England during the Revolutionary War. He is also a very independent character.

His relentless curiosity about the unknown was developed from his quest to understand his new vampire side.

Garrett is shown to be anglophobic in the movie; he expresses hatred toward English men due to his history with them, and loved to feed on them. His hatred goes to disliking the Beatles. Garrett found common ground with Liam in the movie—they both have a hatred for the English and both fought in rebellions against England during their lives as humans.

Kate is a member of the Denali coven, who has the gift to shock others with an electrical touch. When Garrett first meets her family, he becomes interested with their lifestyle. Eventually, he feels curious about Kate's gift and allows her to shock him to test his endurance. The shock sends him on his knees, but he finds it as "something".

Garrett and Kate.

As time passes, the two bond very quickly through their flirtations and joking arguments about animal blood.

At the end of Breaking Dawn, he becomes Kate's mate and moves to Denali to live with her coven. For his sake, Kate begins to attempt monogamy for the first time in her long life. He also comforts Kate for her loss of Irina.